Speaker
Martin Hoferichter
Description
A precision determination of the pion-nucleon sigma term requires the consideration of isospin-breaking corrections, given that such effects are enhanced due to the chiral suppression of the isoscalar pion-nucleon amplitude. In particular, when comparing phenomenological and lattice-QCD determinations, it is critical that consistent definitions be employed. In the talk, I will give an update on the determination of the sigma term from pion-nucleon scattering, focusing on the role of isospin violation.
